At this point, i7 is probably the way to go. LGA775 socket is more or less EOL now.
It isn't really a performance thing, its the fact that no new processor is coming out on the socket, so if you stick with a LGA775 system, I can't condone anything less than a E8600 or a Q9550 powering it.
The advantage of i7, is there is a decent (> 50%) possibility that intels next CPU will also be on the same socket, giving a better upgrade path for the future.
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